What are the working principles and advantages of plasma spraying?

The principle of plasma spraying technology is to change the surface properties of the material, heat the sprayed material to a molten or semi molten state with a certain heat source, blow it into small particles, and spray it onto the surface of the substrate through island velocity airflow to form various coating processing methods. Plasma spraying not only has the same size as other spraying methods, but also has advantages such as unlimited part size, wide substrate material, small processing edge, and ordinary substrate surface spraying reinforcement.

Compared with plasma spraying methods, plasma spraying technology is a relatively new thermal spraying technology with many advantages. The working environment depends on the material and size distribution of the sprayed particles, which may pose health and safety risks. The current approach is to place the work in a circle to minimize any possible risks and limit the mobility of the machine. Considering the chip current, this is a major drawback. The version of this system is compact enough to be easily moved around the workshop.

Advantages of plasma spraying

1. The substrate is less heated. The parts do not deform and the heat treatment state remains unchanged.

The base metal does not melt because the parts do not have electricity during spraying, and the plasma flame temperature is high, but the energy is concentrated, resulting in a large axial temperature gradient of the plasma arc. The temperature rise of general parts does not exceed 2000 ℃, and the parts will not deform, which is very beneficial for the repair of thin-walled parts, thin rods, and certain parts. Due to the unchanged heat treatment performance of the base metal below 200 ℃, some high-strength steel can be sprayed.

2. There is a wide range of spraying materials and a wide variety of coating types.

Due to the high temperature of plasma smoke, various spraying materials can be heated to a molten state and can be widely used in plasma smoke materials, obtaining various properties such as wear-resistant coatings, insulation coatings, high-temperature oxidation resistant coatings, and insulation coatings. In terms of the universality of coatings, plasma spraying is inferior to oxyacetylene flame spraying, arc spraying, high-frequency induction spraying, and explosive spraying.